Commit-ID: c55b8550fa57ba4f5e507be406ff9fc2845713e8 Gitweb: https://git.kernel.org/tip/c55b8550fa57ba4f5e507be406ff9fc2845713e8 Author: H.J. Lu <[email protected]> AuthorDate: Mon, 19 Mar 2018 14:08:11 -0700 Committer: Ingo Molnar <[email protected]> CommitDate: Tue, 20 Mar 2018 08:03:03 +0100
x86/boot/64: Verify alignment of the LOAD segment Since the x86-64 kernel must be aligned to 2MB, refuse to boot the kernel if the alignment of the LOAD segment isn't a multiple of 2MB. Signed-off-by: H.J. Lu <[email protected]> Cc: Andy Shevchenko <[email protected]> Cc: Eric Biederman <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Juergen Gross <[email protected]> Cc: Kees Cook <[email protected]> Cc: Kirill A. Shutemov <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Link: http://lkml.kernel.org/r/came9rorr7xsjguficozluqwuwymrxxpogbw38%2bpn%3d9g%[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- arch/x86/boot/compressed/misc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c index 98761a1576ce..252fee320816 100644 --- a/arch/x86/boot/compressed/misc.c +++ b/arch/x86/boot/compressed/misc.c @@ -309,6 +309,10 @@ static void parse_elf(void *output) switch (phdr->p_type) { case PT_LOAD: +#ifdef CONFIG_X86_64 + if ((phdr->p_align % 0x200000) != 0) + error("Alignment of LOAD segment isn't multiple of 2MB"); +#endif #ifdef CONFIG_RELOCATABLE dest = output; dest += (phdr->p_paddr - LOAD_PHYSICAL_ADDR);
